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ceregsetvalueex (rapi)
 

rapi is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for ceregsetvalueex in other DLLs exists, click on Find References to the right.

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Summary
This function stores data in the value field of an open registry key. It can also set additional value and type information for the specified key.

C# Signature:

[DllImport("rapi.dll", CharSet=CharSet.Unicode)]
public static extern int CeRegSetValueEx(
    uint hKey,
    string lpValueName,
    int lpReserved,
    int dwType,
    byte[] lpData,
    int cbData);

User-Defined Types:

uint HKEY_CLASSES_ROOT = 0x80000000;
uint HKEY_CURRENT_USER = 0x80000001;
uint HKEY_LOCAL_MACHINE = 0x80000002;
uint HKEY_USERS = 0x80000003;

Notes:

function info on msdn at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceactsy/html/cerefCeRegSetValueExRAPI.asp

Tips & Tricks:

Please add some!

Sample Code:

uint key;
uint ret = CeRegOpenKeyEx(HKEY_CURRENT_USER,"Software\\TestApp\\Settings",0,0x1,out key);

if(ret == 0)
{
    // we have to convert everything to byte arrays and add the null terminator ourselves because of
    // issues with pocket pc 2003 (worked fine with strings in 2000 and 2002)

    byte[] lpData = new byte[System.Text.Encoding.Unicode.GetByteCount(textValue) + 1];
    byte[] tmp = System.Text.Encoding.Unicode.GetBytes(textValue);
    for(int i = 0; i < tmp.Length; i++)
        lpData[i] = tmp[i];
    lpData[lpData.Length - 1] = Convert.ToByte('\0');
    CeRegSetValueEx(key,"thisVal",0, 1, lpData, lpData.Length + 1);
}

CeRegCloseKey(key);

Visual Basic

    Private Sub SaveValue(ByVal thisval As String, ByVal textvalue As String)
    'please check this code below
    Dim key As UInteger
    Dim ret As UInteger = CeRegOpenKeyEx(HKEY_CURRENT_USER, "Software\TestApp\Settings", 0, &H1, key)

    If ret = 0 Then
        ' we have to convert everything to byte arrays and add the null terminator ourselves because of
        ' issues with pocket pc 2003 (worked fine with strings in 2000 and 2002)

        Dim lpData As Byte() = New Byte(System.Text.Encoding.Unicode.GetByteCount(textvalue)) {}
        Dim tmp As Byte() = System.Text.Encoding.Unicode.GetBytes(textvalue)
        For i As Integer = 0 To tmp.Length - 1
        lpData(i) = tmp(i)
        Next
        lpData(lpData.Length - 1) = Convert.ToByte(ControlChars.NullChar)
        CeRegSetValueEx(key, thisval, 0, 1, lpData, lpData.Length + 1) '??
    End If

    CeRegCloseKey(key)

    End Sub

Alternative Managed API:

Documentation

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